I'm sure I might be flamed on this one but I love my Odyssey PC625 Drycells. It's a sealed battery. I used to go through 2 batteries a year with my bikes and I have just replaced these for the first time since '04. They are a bit steep at 100 bucks a piece but I was buying 3-4 lead acids a year. I have '98 951 bikes and cranks them beautifully each time and my GTX LTD is a bit stubborn the first crank of the weekend so they will hold a crank cycle for quite a while. I think last time I ordered I got them from overtons'. Not sure if SEADOOFORUM.COM allows links but here it is. Make sure it fits your bike of course.
